DEVICE FOR TESTING BREAKS IN LIGHT-SIGNAL LAMP CIRCUIT Russian patent published in 1994 - IPC

FIELD: transport means. SUBSTANCE: device has sealed-contact reed relay 3, the first and the second diodes 4 and 5, the first and the second current-setting resistors 6 and 7, AND gate 8. Sealed-contact reed relay 3 and inductance coil 2 applied onto the reed relay 3 form current transducer which is closed when current flows through lamp 13 being under testing. The first resistor 6 and the second diode 4, as well as the second resistor 7 and the second diode 5, have to be the formers of logic signals which enter logic inputs of AND gate 8. Independently on condition of lamp 13 being under testing (without taking into account if it is turn on or turn off), when there is a breakage in the circuit, logic "unit" signals enter both logic inputs of AND gate 8, that results to setting of logic "unit" signal in the output of AND gate 8, which then enters input of indicator 9 and turns in on. In the case, logic "unit" signal is available in the output terminal 12, that permits to connect the device to any automatized control equipment. EFFECT: improved functional reliability due to elimination of influence of operation mode and parameters of light-signal system lamps on parameters of the device units. 1 dwg